验证码生成类php

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<?php
/*
    more & original php framwork
    copyright (c) 2007 - 2008 ismole inc.
 
    $id: mooseccode.class.php 38 2008-03-19 07:39:17z aming $
*/
 
!defined('IN_MOOPHP') && exit('Access Denied');
 
class MooSeccode {
    //note:生成的验证码
    var $cecCode = '';
    //note:生成的图片
    var $codeImage = '';
    //note:干扰素
    var $disturColor = '';
    //note:验证码的图片宽度
    var $codeImageWidth = '80';
    //note:验证码的图片高度
    var $codeImageHeight  = '20';
    //note:验证码位数
    var $cecCodeNum = 4;
     
    /**
     * 输出头部
     *
     */
    function outHeader() {
        header("content-type: image/png");
    }
     
    /**
     * 生成验证码
     *
     */
    function createCode() {
        $this->cecCode = strtoupper(substr(md5(rand()),0,$this->cecCodeNum));
        return $this->cecCode;
    }
 
    /**
     * 生成验证码图片
     *
     */
    function createImage() {
        $this->codeImage = @imagecreate($this->codeImageWidth,$this->codeImageHeight);
        imagecolorallocate($this->codeImage, 200, 200, 200);
        return $this->codeImage;
    }
     
    /**
     * 加入图片干拢素
     *
     */
    function setDisturbColor() {
        for ($i=0; $i<=128; $i++) {
            $this->disturColor = imagecolorallocate($this->codeImage, rand(0,255), rand(0,255), rand(0,255));
            imagesetpixel($this->codeImage,rand(2,128),rand(2,38),$this->disturColor);
        }
    }
 
    /**
     * 设置验证码图片的大小
     *
     * @param integer $width：
     * @param integer $height：
     * @return boolean;
     */
    function setCodeImage($width, $height) {
        if($width == '' || $height == '') { return false; }
        $this->codeImageWidth = $width;
        $this->codeImageHeight = $height;
        return true;
    }
 
    /**
     * 在图片上写入验证码
     *
     * @param integer $num
     */
    function writeCodeToImage($num = '') {
        if($num != '') {$this->cecCodeNum = $num;}
        for($i = 0; $i <= $this->cecCodeNum; $i++) {
            $bg_color = imagecolorallocate ($this->codeImage, rand(0,255), rand(0,128), rand(0,255));
            $x = floor($this->codeImageWidth / $this->cecCodeNum) * $i;
            $y = rand(0,$this->codeImageHeight - 15);
            imagechar($this->codeImage, 5, $x, $y, $this->cecCode[$i], $bg_color);
        }
    }
     
    /**
     * 把验证码的值写入session
     *
     * @param string $sname
     */
    function writeSession($sname) {
        session_start();
        session_register($sname);
        $_SESSION[$sname] = md5($this->cecCode);
    }
 
    /**
     * 输出验证码图片
     *
     * @param integer $width
     * @param integer $height
     * @param integer $num
     * @param string $sname
     */
    function outCodeImage($width = '', $height = '' ,$num = '', $sname = 'code') {
        if($width !== '' || $height !== '') {
            $this->setCodeImage($width, $height);
        }
        $this->outHeader();
        $this->createCode();
        $this->createImage();
        $this->setDisturbColor();
        $this->writeCodeToImage($num);
        $this->writeSession($sname);
        imagepng($this->codeImage);
        imagedestroy($this->codeImage);
    }
}
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